I have been going gym for about a month and a half and i have seen gains on all excerise i an lift 18-20kg on incline using dumbells. But on bench press i can only do 12.5 or very few reps of 15kg a side.

How come i have not been able to see any gains on bench i am not expecting miracles over night but its a bit confusing as i can lift more with dubells and not bench

Thanken you

 

Ask someone to check your form on dumbells. It's quite easy to cheat on them by bringing them into your body more so there is less movement and what yu are doing is more of a fly.